When the late summer wind blew the sycamore leaves past the classroom window, Lin Wanxing noticed the transfer student Jiang Yubai for the first time - he was standing next to the podium holding an old textbook, his white shirt stained with fine chalk dust, and his eyes as cold as the ice soda in the laboratory building next door. As the "student leader" who is firmly in the top three in her grade, Lin Wanxing's life was a fixed cycle of answering questions, collecting homework, and helping the teacher to monitor her self-study, until Jiang Yubai became her deskmate, breaking all peace. He would secretly put a cup of hot milk when she stayed up late to catch up on competition questions, and calmly rescued her when she was teased by naughty classmates, but he never mentioned the reason why he changed schools to anyone. Lin Wanxing also discovered during their interactions with each other that this cold young man's notebook contained a blurry profile photo of her that was taken in the library last year. The chirping of cicadas is getting louder and the graduation countdown bell is ringing. The notes they secretly passed under the desks piled with test papers, the tree-lined avenue they walked side by side after evening study, and the umbrella they held together on a rainy day have all become secrets hidden in time. When Jiang Yubai's family tragedy suddenly came to light and he was about to transfer to another school, Lin Wanxing clutched the confession letter he had written and revised, and ran in his direction against the light in the crowd of people running in the school morning - "Jiang Yubai, I have understood your secret a long time ago."
